Drawbar



Oct. l2'?, 1925.

A T. G. SCHMEISER DRAWBAR File July 22. 1924 Patented Get. 27, 1925.

; e UNITED'rATES PA 'riinonoitii G. scHivi'yEI'snR, or Davis, caiasciutta. f

Apiication i'eapJuiy 22, i924.' semi No. 727,431. I

Drawbars, of

- Be it known that .I, A'lliriiono'iniz lGr. SCHMEisER, a citizenof the UnitedStates, and areside'nt of Davis, in the countyof 'Yolo I and State fof California', have'invented certain -new' andv useful Improvements 'in which l the* following is 'a specification. j Y

It is one object of the present invention to provide an attachment for a tractor drawhead* that-f-will permitlavertical pivotal movement of the draw-bar carried thereby, whereby to maintain an even draft on the machine drawn, and prevent the draw-bar connection from digging into the ground when the front wheels of the tractor are raised off of the ground through an excessive backward and downward pull on its rear end. j

It is another object of the invention to provide a structure of the character indicated that will automatically throw out the clutch on the tractor when the pull on the tractor is so great as to lift the front wheels olf of the ground.

It is a still further object of the invention to provide an attachment wherein the pivotal points of the draw-bar may be vertically adjusted within given limits.

Finally, ,it is an object of the invention to provide a'device of the character indicated which is composed of few parts, is economical to manufacture, strong, durable, and highly eflicien't in its practical application.

In the drawing Figure 1 lis a side elevation of ther device mounted upon a tractor draw-head..v d

Figure 2 is a plan view of the structure and its mounting as shown in Figure 1.

Figure 3 is a side elevation of the drawbar plate reversed.

Figure 11 is a diagrammatical illustration of the draw-bar as mounted on a tractor and connected to the clutch thereof.

Referring more particularly to the drawing, 1 indicates the di'aw-liead of a tractor of the Fordson type or similar construction provided with orifices @for connecting a machine thereto.

In edecting myv invention I provide -a plate 3 having side flanges l formed lat right angles thereto and provided with orifices 5 adapted to align with orifices 2 inY draw-head 1 so that it may be rigidly mounted thereon as by bolts 6.

The forward portions of flanges 1^ ,are preferably made wider than'the -rear kportions andlaretapped at several points in vertical' alignment-as at'7 to receive threaded bolts8. f OriiicesQ are Vof flaiiges4-to receive bolts'l() upon which thesidefelements 11 of draw-bar 12are'piv- 'otally mounted. f i f he plate being mounted fon' the drawf y head 'l-withfthe flanges lC-eXtending downwardly the draw-bar arms 11 may be mounted thereon by passing bolts l0 through the uppermost orifices v9 or the lowermost of said orifices as conditions may require. Then mount-edupon plate 3 thesearms are limited in their vertical pivotal movement by screwingthe bolts 8 into the upper or lower orifices 7 as theA case may be, and by bolting bar` 13 on to the top of the drawliead 1 as shown, to project over the `said arms 11. 1

The flanges 4 project forwardly of the draw-head 1 so that the pivotal connections formed` in thev rear portion of the draw-bar 12 thereto are just belowV the tractor axle 14'v and slightly to the rear thereof, thereby greatly reducing the tendency of the tractor to turn a backward somersault when subjected to excessive pull from the rear.

I have herein shown one arm 11 or drawbar 12 extending'forwardly a distance under the tractor aXle to form a lever 15 to which a chain 16 is attached, the other end of the chain being attached to the clutch pedal 17 of the tractor.

The result of this construction is, that whenever the machine drawn by the tractor encounters an obstacle o fsuflicient resistance to cause the tractor to rise up. in front, this Y upward pivotal movement about its rear aXle'lL as indicated by the arrow 1S, causes a vdownward movement of pivotal point 10 as indicated by arrow 19. Since the draw- V'bar is held taut between the machine being drawn and the pivotal point 10 the lever arm 15 is forced downwardly, thereby throwing out clutch 17 through the medium of chain 16. This action, of course, auto- `matically disconnects the power from the drive wheels 20 andthe several parts at once resume their normal positions.

In Figure 3 it is shown that the limit lofi vertical adjustment of the' arms l1 may be Vpractically doubled with this device by merely inverting the plate 3 on draw-head 1.

I am aware that I am not the first to provide a draw-bar structure with forwardly extending pivotal connecting points as l0, therefore I do not claim such broadly. I do Claim as new, however, the cut and formed reversible plate with means :for effecting a vertical adjustment of the pivotal points of the draw-bar, and the automatic operation of the clutch by the pivotal movement of the tractor relative to the draw-bar.

I claim 1. A. draw-bar structure comprising a plate adapted to be mounted upon a tractor draw-head and having Side flanges formed thereon, means for pivotally mounting a draw-bar arm at one end of each ange, and means :tor limiting the pivotal movement of the draw-bar arms arranged at the other end of each flange.

2. A draw-bar structure comprising a sheet-metal plate having orilices formed therein to align with the orifices formed head of a tractor, and having end portions thereof turned at right angles thereto to form parallel flanges, means for pivotally mounting a draw-bar arm at one end of each ange, and means for limiting the pivotal movement of the draw-har arms arranged at the other end of each ilange.

3. A draw-bar structure comprising a plate adapted to be mounted upon a tractor draw-head and having side flanges formed thereon, vertically adjustable means for pivotally mounting a draw-bar arm at one end of each flange, and vertically adjustable means for limitingl the pivotal movement of the draw-bar arms arranged at the other end of each flange.

THEoDoRE G. soHMnisnR. 

